package com.example.demo.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.common.BaseContext;
import com.example.demo.common.CoustomException;
import com.example.demo.entity.*;
import com.example.demo.mapper.OrdersMapper;
import com.example.demo.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {
    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;
    //用户下单
    @Transactional
    public void submit(Orders orders){
        //获取当前id
        Long currentId = BaseContext.getCurrentId();
        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper=new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,currentId);
        List<ShoppingCart> list = shoppingCartService.list(lambdaQueryWrapper);
        if(list==null||list.size()==0){
            throw new CoustomException("购物车为空不能下单");
        }
        //查询用户数据
        User byId = userService.getById(currentId);
        //查询地址信息
        Long addressBookId = orders.getAddressBookId();
        AddressBook byId1 = addressBookService.getById(addressBookId);
        if (byId1==null){
            throw new CoustomException("用户地址有吴不可以下单");
        }
        long id = IdWorker.getId();//生成一个订单号
        //原子操作，在多线程高并发保证线程安全
        AtomicInteger amount=new AtomicInteger(0);
        List<OrderDetail> orderDetails=list.stream().map((item)->{
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(currentId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());
        orders.setId(id);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(currentId);
        orders.setNumber(String.valueOf(id));
        orders.setUserName(byId.getName());
        orders.setConsignee(byId1.getConsignee());
        orders.setPhone(byId1.getPhone());
        orders.setAddress((byId1.getProvinceName() == null ? "" : byId1.getProvinceName())
                + (byId1.getCityName() == null ? "" : byId1.getCityName())
                + (byId1.getDistrictName() == null ? "" : byId1.getDistrictName())
                + (byId1.getDetail() == null ? "" : byId1.getDetail()));
        //向订单表插入数据：一条
        this.save(orders);
        //向订单明细表插入多条数据
        orderDetailService.saveBatch(orderDetails);
        //清空购物车数据
        shoppingCartService.remove(lambdaQueryWrapper);
    }

}
